My K3 is often used for work related stuff, and I need to have te same page active for longer than the 10 minutes or so before the kindle goes into sleep mode.

For the K3 you can temporarily disable the screensaver / sleep mode with the ;debugOn, ~disableScreensaver command.

Does anyone know if this works for the Paperwhite as well?
Or even better, can you change the settings for sleep mode or disable it altogether in het regular menu's? Changing the time out period from 10 to 30 minutes would solve my problem.